To put an equation in slope intercept form, clear or solve the equation for y.
This way:
The first equation in slope intercept form is y = 4x + 6.
Once done this step, solve the system by using substitution.
Replace the expression found above for y in the second equation and solve for x.
Using this value of x, found the value of y by replacing x on the equation in slope intercept form.
The solution of this system is x=-1 and y=-6.