Graph of linear equations
We want to find the places where the line
2x - 3y = 12
intercepts y-axis and x- axis
y- intercept
When the line intercepts y axis, we know that x=0, we replace it in the equation so we can find y value:
2x - 3y = 12
↓
2 · 0 - 3y = 12
↓
0 - 3y = 12
-3y = 12
y = 12 / -3
y = -4
x - intercept
In the same way, we find the interception with x- axis when y = 0. We find the value of x replacing y by 0 in the equation:
2x - 3y = 12
↓
2x - 3 · 0 = 12
↓
2x - 0 = 12
2x=12
x = 12 / 2
x = 6
Graph
We locate both points: y = -4 and x = 6:
Finally, we join the points with a straight line