Answer:
To solve for x in 2a we need to set up an equation.
Since there are two equations with x that form a straight angle(180) we can make an equation by adding the given equations to making it equal 180.
(21x - 3) + (5x + 1) = 180
combine like terms
26x - 2 = 180
inverse property of subtraction is addition:
+2 +2
26x = 182
inverse property of multiplication is division:
/26 /26
X = 7
Now to solve for y in 2a:
Same concept, both equations that contain the variable y will be a striaght angle(180) so we form the equation by adding the given equations with the variable y to equal 180(straight angle).
(4y) + (17y - 9) = 180
combine like terms
21y - 9 = 180
inverse operation of adding is subtracting
+9 +9
21y = 189
Inverse property of multiplying is dividing
/21 /21
y = 9
*I'm sorry I can only help you with 2a*
for 2b use the same idea as I did with 2a or seek help from guardian members