Question 32474
2x+y=-3 for y=7

step 1:substituting 7 for y gives you the equation: 2x+7=-3
step 2:isolate the variable by subtracting 7 from both sides. what you do to one side of an equation you must also do to the other.
step 3: the opposite of the opposite of any integer is the integer itself so we would write out -3-7as -3+(-7) and add.
step 4:divide both sides by 2 to isolate the variable(x)
remember the rule for dividing integers

2x+7=-3
2x+7-7=-3-7
2x=-3+(-7)
2x=-10
2x/2=-10/2
x=-5